Process of preparation from starch, of esters of the higher fatty acids, soluble in hydrocarbons of the aromatic series



'30 chlorides of the aforesaid acids.

Patented Dec. 6, 1927.

UNITED. STATES PATENT. OFFICE.

ram. nausea, or 1.30m, FRANCE, assrenon r soorE'rE 1m srmnnmnm n'rsavonnamn rm LYON, or LYON, FRANCE.

PROCESS OF PREPARATION SOLUBLE IN No Drawing. Applicationfiled March 6,1923,

' aration of soluble esters of the higher fatty acids from ordinarystarch. The process allows the preparation of thin, transparent,uninflammable films which, owing to their solubility, are ap licable tothe greatest variety of technica purposes. The solutions of thesubstances obtained by this process are completely clear and, by meansof evaporation, transparent substances are obtained even ivitho tsubsequent addition of an adjuvant. T e process enables the starch to.

be completely used without previous preparation by transformation intosoluble starch. The carbohydrate esters obtained by my process aresolublein the aromatic series of hydrocarbons such as benzene or toluenewhereas the known cellulose esters are entirely insoluble in thesesubstances.

The esterification of the starch is effected by the direct action on thelatter of the acid The reaction, which can proceed by mixing the variousdiluted or non-diluted components in chloroform, tetrachloride ofcarbon, halogenous derivatives of acetylene, etc. is facilitated by theaddition of such substances as, chloride of zinc, pyridine, uinoline orany like bases. It is primed at tie? usual temperature with a. notabledischarge of heat;.it is completed by gradually 40 raising thetemperature.

The carbohydrate esters appear in the form ofscentless amorphous beads,uninfiammable, soluble in a very. large number of solvents, and, inparticular, chloroform, halogenous lene, tetrachloderivatives of acetyride of carbon and benzemc hydrocarbons such as benzene,

toluene and the like.

FROM STARCH, HYDROGARBONS'OF THE AROMATIG SERIES.

an indication shows of benzene,

0F ESTEBS OF THE HIGHER FATTY ACIDS,

Serial No. 623,283, and in France December 21, 1922.

The solutions of carbohydrate esters are perfectly clear and furnish bymeans of evaporation alone colorless, translucentand uninfiammablepellicles.

These properties enable the solutions to be employed, either pure ormixed with cellulose esters in the manufacture of various plasticmaterials, coatings, sizes, fabrics, stuffs, papers, leathers,photographic and cinematographic films.

The following example, given merely the process to be lowed for themanufacture of palmitate of starch:

100 grams of dry starch are moistened with a mixture of 400 grams ofbenzene and 180,grams of pyridine; a mixture of 600 grams of palmitylchloride and 400 grams of benzene is added by portions; the heat ingfollows for half an hour in the water bath at with continual stirring.When the reaction is terminated the ester formed is precipitated thenfollows washing,

The palmitate of etc.

drying,

obtained, disstarch solved in benzene gives, by evaporation o .thesolvent, a colorless,

translucent and uninfiammable film. The suitable apparatus are those nowemployed in the chemical industry. What I claim as my to securebyLetters Patent of the United States is -A process for the preparation ofstarch esters consisting in moistening starch with a mixture of benzeneand pyridine, adding a mixture of palmityl chloride and benzene, heatinthe whole with continual stirring precipitating the starch esters by theaddition of alcohol and washing and drying the same.

In witness whereof I have signed this specification.

PAUL BERTHON.

varnishes,

by the addition of alcohol;

invention and desire

